function A = pro_create_A_1127(m,mu)
%PRO_CREATE_A_1127 generarte A with given m and \mu.
A=zeros(m+1,m+1);
x=1-1.5*mu+0.5*mu*mu;
y=2*mu-mu*mu;
z=-0.5*mu+0.5*mu*mu;
for i=[1:m-1]
   A(i,i)=x-1;
   A(i,i+1)=y;
   A(i,i+2)=z;
end
A(m,1)=z;
A(m,m)=x-1;
A(m,m+1)=y;
A(m+1,1)=y;
A(m+1,2)=z;
A(m+1,m+1)=x-1;
end

